On Mon, Oct 8, 2012 at 12:07 AM, Rafael J. Wysocki <r...@sisk.pl> wrote:
> On Wednesday 03 of October 2012 21:26:17 Miles Lane wrote:
>> ACPI: Preparing to enter system sleep state S3
>> PM: Saving platform NVS memory
>> Disabling non-boot CPUs ...
>> numa_remove_cpu cpu 1 node 0: mask now 0
>> Broke affinity for irq 46
>> smpboot: CPU 1 is now offline
>> BUG: sleeping function called from invalid context at kernel/mutex.c:269
>> in_atomic(): 0, irqs_disabled(): 1, pid: 3561, name: pm-suspend
>> 4 locks held by pm-suspend/3561:
>> #0: (&buffer->mutex){+.+.+.}, at: [<ffffffff8113cab6>]
>> sysfs_write_file+0x37/0x121
>> #1: (s_active#98){.+.+.+}, at: [<ffffffff8113cb50>]
>> sysfs_write_file+0xd1/0x121
>> #2: (autosleep_lock){+.+.+.}, at: [<ffffffff810616c2>]
>> pm_autosleep_lock+0x12/0x14
>> #3: (pm_mutex){+.+.+.}, at: [<ffffffff8105c06c>] pm_suspend+0x38/0x1b8
>> irq event stamp: 103458
>> hardirqs last enabled at (103457): [<ffffffff81460461>]
>> __mutex_unlock_slowpath+0x101/0x125
>> hardirqs last disabled at (103458): [<ffffffff8105be25>]
>> arch_suspend_disable_irqs+0xa/0xc
>> softirqs last enabled at (103196): [<ffffffff8103445d>]
>> __do_softirq+0x12a/0x155
>> softirqs last disabled at (103171): [<ffffffff8146836c>]
>> call_softirq+0x1c/0x30
>> Pid: 3561, comm: pm-suspend Not tainted 3.6.0+ #26
>> Call Trace:
>> [<ffffffff8106b64e>] ? print_irqtrace_events+0x9d/0xa1
>> [<ffffffff8104efcd>] __might_sleep+0x19f/0x1a8
>> [<ffffffff81460345>] mutex_lock_nested+0x20/0x3b
>> [<ffffffff81391cbb>] ledtrig_cpu+0x3b/0x7b
>> [<ffffffff81391d29>] ledtrig_cpu_syscore_suspend+0xe/0x15
>> [<ffffffff813329e9>] syscore_suspend+0x78/0xfd
>> [<ffffffff8105bf42>] suspend_devices_and_enter+0x10f/0x201
>> [<ffffffff8105c133>] pm_suspend+0xff/0x1b8
>> [<ffffffff8105b4fa>] state_store+0x43/0x6c
>> [<ffffffff811c5ba6>] kobj_attr_store+0xf/0x1b
>> [<ffffffff8113cb68>] sysfs_write_file+0xe9/0x121
>> [<ffffffff810e48a3>] vfs_write+0x9b/0xfd
>> [<ffffffff8106bc63>] ? trace_hardirqs_on+0xd/0xf
>> [<ffffffff810e4ac6>] sys_write+0x4d/0x7a
>> [<ffffffff814672f4>] tracesys+0xdd/0xe2
>
> Well, this most likely has been introduced by commit:
>
> commit 8f88731d052d2b14f332249a9332690ac1b365ac
> Author: Bryan Wu <bryan...@canonical.com>
> Date: Sat Jun 25 18:33:50 2011 +0800
>
> led-triggers: create a trigger for CPU activity
>
> because ledtrig_cpu_syscore_suspend() is run in atomic context, which kind of
> doesn't play well with mutexes.
>
> Linus, Bryan, care to fix this?
I haven't worked on this patch for ages, the only reason my SoB
is in there is that I think an early patch of mine was used as starting
point...
Bryan can you look at this?
Yours,
Linus Walleij
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